package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFiler",urlPatterns = "/*")
public class LoginCheckFiler implements Filter {
    //路径匹配，支持通配符
    public static  final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        Long empId = (Long) request.getSession().getAttribute("employee");

        Long userId = (Long) request.getSession().getAttribute("user");




        //获取本次请求的URL
        String requestURI = request.getRequestURI();
        log.info("拦截的请求：{}",requestURI);

        //不需要的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/**"
        };

        //判断是否要处理
        boolean check = check(urls, requestURI);

        //不需要处理，直接放行
        if (check){
            log.info("本次{}请求不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //判断登录状态，如果以登录，直接登录
        if (empId != null){
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        if (userId != null){
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }


        log.info("用户未登录");
        //用户未登录，返回未登录结果，通过输出流方式向客户端页面相应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;

    }


    


    /**
     * 路径匹配，检查是否需要放行
     * @param urls
     * @param request
     * @return
     */
    public boolean check(String[] urls,String request){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,request);
            if (match){
                return true;
            }
        }
        return false;
    }




}
